Clocks

Q.

Which is the most accurate atomic clock?

Q.

What is the least count of your wristwatch? Is it same for all kind of watches.

Q.

Earliest time piece in record

1. Sundial

2. Water clock

3. pocket watch

4. Sand clock

Q.

What is the weight of a pendulum called?

Q. The ratio of the speed of the tip of minute hand to the speed of the tip of the second is:
(Assume same lengths of both hands.)

1. 1:60
2. 60:1
3. 3600:1
4. 1:3600

Q. Stopwatches and stop clocks are used

1. as 24-hour clocks
2. as 12-hour clocks
3. for accurate measurement of time intervals
4. for finding average time

Q. Minute hand covers 1 rotation in _______ minutes.

1. 60
2. 90
3. 15
4. 120

Q. Which of the following is/are true regarding atomic clock?

1. Atomic clocks are very much radioactive
2. It counts how many times the atom switches from positive to negative and vice versa and then uses that number to measure the passing of time
3. An atomic clock measures the amount of time it takes for an atom to switch its energy state
4. Atomic clocks don't operate by measuring energy particles

Q. A digital clock shows time using _______.

1. three clock hands
2. images
3. numerical values
4. two clock hands

Q. Find the time if in an analog clock, the hour hand is at 9 and the minute hand makes an angle of ${90}^{\circ }$ with the hour hand.

1. 9:15
2. 9:00
3. 9:45
4. 9:30

Q. Which of the following is/are correct regarding candle clock?

1. Candle clock used tall candles to show the passing of time
2. The candles had evenly spaced lines on them that were usually marked with numbers for each hour
3. When the candle burned down to one of the numbers, it showed what time it was
4. All of the above

Q.

Which of the following is an example of oscillatory motion?

1. Motion of an electric fan

2. Motion of a spinning top

3. Motion of pendulum of a wall clock

4. Motion of a stone dropped from a roof

Q. What is common among the following images?

1. 
2. 
3. 
4. 

Q. what is a pendulum and what is extreme position of the pendulum?

Q. Which of the following is/are correct regarding pendulum?

1. A pendulum is made up of a string or solid rod with a weight attached to the end
2. Gravity is not only the force that keeps the pendulum moving
3. The amount of time it takes for a pendulum to swing from one side to the other and back again is called a period
4. All of the above

Q. Atomic clock is based on the principle of periodic vibration in the _______.

1. Polonium atom
2. Uranium atom
3. Carbon atom
4. Caesium atom

Q.

$1hectare=\_\_\_\_\_\_\_\_\_m^2$

Q.

$1$Hectare = _______________ $m^2$